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Petrogenesis and Tectonic Implications of Peralkaline A-Type Granites and Syenites from the Suizhou-Zaoyang Region,Central China 被引量:8
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作者 Hafizullah Abba Ahmed Changqian Ma +4 位作者 Lianxun Wang Ladislav A.Palinkas Musa Bala Girei Yuxiang Zhu Mukhtar Habib 《Journal of Earth Science》 SCIE CAS CSCD 2018年第5期1181-1202,共22页
In this study, we present systematic petrological, geochemical, LA-ICP-MS zircon U-Pb ages and Nd isotopic data for the A-type granites and syenites from Suizhou-Zaoyang region. The results show that the peralkaline A... In this study, we present systematic petrological, geochemical, LA-ICP-MS zircon U-Pb ages and Nd isotopic data for the A-type granites and syenites from Suizhou-Zaoyang region. The results show that the peralkaline A-type granites and syenites were episodically emplaced in Suizhou-Zaoyang region between 450±3 and 441±7 Ma which corresponds to Late Ordovician and Early Silurian periods, respectively. Petrologically, the syenite-peralkaline granite association comprises of nephefine normative-syenite and alkaline granite in Guanzishan and quartz normative syenite and alkafine granite in Huangyangshan. The syenite-granite associations are ferroan to alkali in composition. They depict characteristics of typical OIB (oceanic island basalts) derived A-type granites in multi-elements primitive normalized diagram and Ybffa vs. Y/Nb as well as Ce/Nb vs. Y/Nb binary plots. Significant depletion in Ba, Sr, P, Ti and Eu indicates fractionation of feldspars, biotite, amphiboles and Ti-rich augite. The values of eNd(t) in Guanzishan nepheline syenite and alkaline granite are +1.81 and +2.26, respectively and the calculated two-stage model age for these rocks are 1 040 and 1 003 Ma, respectively. On the other hand, the Huangyangshan alkaline granite has eNd(t) values ranging from +2.61 to +3.46 and a relatively younger two-stage Nd model age values ranging from 906 to 975 Ma, respectively. Based on these data, we inferred that the Guanzishan nepheline syenites and granites were formed from fractional crystallization of OIB-like basic magmas derived from upweliing of metasomatized lithospheric mantle. The Huangyangshan quartz syenite and granite on the other hand, were formed from similar magmas through fractional crystallization with low input from the ancient crustal rocks. Typically, the rocks exhibit Al-type granite affinity and classified as within plate granites associated with the Ordovician crustal extension and the Silurian rifting. 展开更多
关键词 Huangyangshan guanzishan OIB derived A-type granites nepheline syenite alkaline granite South Qinling Suizhou-Zaoyang region.
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从壁画砖看南京西善桥宫山墓的年代 被引量:8
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作者 王汉 《东南文化》 CSSCI 北大核心 2018年第2期81-91,共11页
从南京西善桥宫山南朝"竹林七贤与荣启期"大型拼镶砖印壁画墓出土壁画砖的砖面标记文字、砖的拼装方法以及砖的尺寸规格等方面来看,该墓的年代应该在丹阳金家村墓和吴家村墓之前。一向被认为是陈朝墓的西善桥罐子山墓也应该... 从南京西善桥宫山南朝"竹林七贤与荣启期"大型拼镶砖印壁画墓出土壁画砖的砖面标记文字、砖的拼装方法以及砖的尺寸规格等方面来看,该墓的年代应该在丹阳金家村墓和吴家村墓之前。一向被认为是陈朝墓的西善桥罐子山墓也应该与此墓年代相仿。 展开更多
关键词 南朝 竹林七贤与荣启期 砖印壁画 宫山墓罐子山
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湖北观子山硬玉钙霞正长岩初步研究 被引量:4
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作者 李石 《岩石矿物学杂志》 CAS CSCD 1990年第1期22-30,共9页
观子山侵入体从岩体中心到边部,由硬玉钙霞正长岩、硬玉正长岩和黑云角闪正长岩组成。本文着重讨论硬玉钙霞正长岩的岩石学、矿物学、岩石化学、REE地球化学、时代及岩石成因。据Rb-Sr等时线测定,其年令值为306Ma,说明它形成于海西期。... 观子山侵入体从岩体中心到边部,由硬玉钙霞正长岩、硬玉正长岩和黑云角闪正长岩组成。本文着重讨论硬玉钙霞正长岩的岩石学、矿物学、岩石化学、REE地球化学、时代及岩石成因。据Rb-Sr等时线测定,其年令值为306Ma,说明它形成于海西期。根据产状,FeO/MgO,^(87)Sr/^(86)Sr(i)、REE分配模式以及形成硬玉的压力温度条件,足以证明硬玉钙霞正长岩的成因与上地幔物质有关。 展开更多
关键词 硬玉钙霞正长岩 铷-锶等时线 湖北 岩石学 REE地球化学 成因
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